Welcome to the WC Pastel Forum, John!
Glad you have joined us!
I'm not certain exactly what sort of assistance you need, John, but I did a painting a while ago that had a little brass pot in it. Although the painting overall wasn't a success, the brass pot turned out well, I think. So, here, briefly, is how I did it:
Keep in mind that shiny surfaces are all about the reflections of whatever is near the shiny object - other objects, background, lights, base that the object is sitting upon. In this case, there was an apricot right in front of the brass pot. The adjacent objects will really dramatically change the colors one sees reflected in the shiny surface.
In this detail, first, I painted the major shapes/reflections of the pot. The lighter areas were done with a medium value yellow, a putty sort of color, and a light to medium value dullish green (the greens I used were just a tad on the blue side), while the darker areas were done with a little darker version of the same colors, and the highlights were roughly indicated with a very light yellow (since my pot had the reflection of the apricot, too, I also used some oranges, but I don't think orange would otherwise occur in a brass pot):
I added some even darker tones (in this case primarily because I had decided to decrease the light and darken the background). Then all the reflections were developed further. Dark areas away from the light were blended into the background a bit (lost edges):
Hope that helps...